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  <title>Waits for a read lock</title>
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  <div id="layout-content"><div id="syncreaderwriter.readlock" class="refentry">
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  <h1 class="refname">SyncReaderWriter::readlock</h1>
  <p class="verinfo">(PECL sync &gt;= 1.0.0)</p><p class="refpurpose"><span class="refname">SyncReaderWriter::readlock</span> &mdash; <span class="dc-title">Waits for a read lock</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-syncreaderwriter.readlock-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SyncReaderWriter::readlock</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$wait</code><span class="initializer"> = -1</span></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Obtains a read lock on a <span class="classname"><a href="class.syncreaderwriter.html" class="classname">SyncReaderWriter</a></span> object.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-syncreaderwriter.readlock-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt>
<code class="parameter">wait</code></dt>

    <dd>

     <p class="para">
      The number of milliseconds to wait for a lock.
      A value of -1 is infinite.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-syncreaderwriter.readlock-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-syncreaderwriter.readlock-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-3368">
   <p><strong>示例 #1 <span class="function"><strong>SyncReaderWriter::readlock()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$readwrite&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SyncReaderWriter</span><span style="color: #007700">(</span><span style="color: #DD0000">"FileCacheLock"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$readwrite</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">readlock</span><span style="color: #007700">();<br /></span><span style="color: #FF8000">/*&nbsp;...&nbsp;*/<br /></span><span style="color: #0000BB">$readwrite</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">readunlock</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-syncreaderwriter.readlock-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member"><span class="methodname"><a href="syncreaderwriter.readunlock.html" class="methodname" rel="rdfs-seeAlso">SyncReaderWriter::readunlock()</a> - Releases a read lock</span></li>
  </ul>
 </div>


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